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学信号的英语高手近来
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作者： larf241
01-01 08:00
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一个关于相位补偿FFT. 的毕业设计摘要.需要翻译成英语.请高手们帮忙翻译下, 不胜感激!谢谢了!
快速散傅立叶变换 (FFT)是在测量频谱领域中应用最为广泛的一种算法。但由于非同步采样以及时、频域有限化和离散化等原因，常规FFT在对信号进行频谱分析时会产生较大误差，测量结果难以满足高检测精度的要求。频谱校正理论近年来广泛应用于信号分析及故障诊断等领域，但让需要进一步的研究。因此，为了进一步开展频谱校正理论的应用研究，补充和发展频谱校正理论和方法，具有重要的理论意义和实用价值。
从频谱地的检测精度角度出发，首先回顾了FFT和频谱校正的发展历程，介绍了常见的提高FFT算法分析精度的多种改进方法，阐明了本文的研究背景；其次对傅立叶变换的基本理论 、基本形式以及实际应用中应注意的问题进行了详细的阐述，对传统的基于加窗 FFT的检测方法产生误差的原因进行了深入分析，提出了频谱泄漏误差的解析表达式及校正方法的数学模型。进而对多种频谱校正方法的基本原理进行了数学推导，给出了实现具体算法的详细步骤，对各种方法的特点及其在技术中的适用条件作了探讨和比较；进而针对典型信号，借助 MATLAB语言对传统FFT算法和本文引入的校正方法进行仿真，通过对仿真的结果和算法复杂度的分析和对比，验证了用相位补偿的方法来实现频谱校正的有效性和优越性，阐述了算法的特性及优缺点，同时对这种新的算法如何进一步提高校正方法的精度做出了铺垫与展望。 |
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回复：学信号的英语高手近来
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作者：
01-01 08:00
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回复：学信号的英语高手近来
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作者： liuadolf
06-06 11:31
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Fast casual Fourier Transform (FFT) spectrum measurements in the field of the most widely used algorithm. However, as non-synchronous sampling and the time and frequency domain finite and discrete reasons, In conventional FFT spectrum of the signal analysis will have a greater error, Measuring results is difficult to meet the high measurement accuracy requirements. Spectrum correction theory is widely used in signal analysis and fault diagnosis and other areas, but the need for further research. Therefore, in order to further develop the theory of spectral correction applied research, and development of additional spectrum correction theory and method has an important theoretical and practical value. From the spectrum of detection accuracy perspective, first recalled the FFT spectrum and the development process of correction, on the common FFT analysis to improve the accuracy of a variety of improved methods to clarify the background of the research; Second, the basic Fourier transform theory, basic and practical application forms should pay attention to the issue of detailed, Based on the traditional window FFT error detection methods of the reasons why the in-depth analysis, Leakage of the spectrum of analytic expressions error correction method and the mathematical model. Then the spectrum correction for a variety of the basic principle of mathematical derivation is given a specific algorithm to achieve the detailed steps, on the characteristics of the various methods and technology in the applicable conditions are discussed and compared. Furthermore, for a typical signal, using MATLAB language of the traditional FFT algorithm and the introduction of this correction method for simulation, Based on the simulation results and the complexity of the algorithm is analyzed and compared, verified with phase compensation methods to achieve spectral tuning the effectiveness and superiority of the algorithm described the characteristics, advantages and disadvantages, while this new algorithm on how to further improve the accuracy of Correction made bedding and Prospect. |
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